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Updated: Feb 23, 2026

Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
Published on: September 8, 2017
Phase diagrams of the LiBH4-NaBH4-KBH4 system
Erika M Dematteis1, Eugenio R Pinatel, Marta Corno
1Department of Chemistry and Inter-departmental Center Nanostructured Interfaces and Surfaces (NIS), University of Turin, Via Pietro Giuria 7, 10125 Torino, Italy. marcello.baricco@unito.it.
This study details the thermodynamic properties and phase diagrams of the lithium, sodium, and potassium borohydride system. A new ternary eutectic composition was identified, melting at 102°C, crucial for material science applications.
Area of Science:
- Materials Science
- Thermodynamics
- Computational Chemistry
Background:
- Understanding the phase behavior of alkali metal borohydride systems is essential for developing advanced materials.
- Accurate thermodynamic data and phase diagrams are critical for predicting material properties and guiding synthesis.
Purpose of the Study:
- To comprehensively determine the thermodynamic properties and phase diagrams of the LiBH4-NaBH4-KBH4 ternary system.
- To investigate the thermal stability and phase transitions of synthesized borohydride mixtures.
- To identify novel eutectic compositions and their melting points within the ternary system.
Main Methods:
- Utilized the Calphad method for thermodynamic assessment of binary and ternary borohydride systems.
- Synthesized ternary system samples via ball milling and manual mixing.
- Employed in situ synchrotron radiation X-ray diffraction and differential scanning calorimetry for thermal stability analysis.
Main Results:
- Established thermodynamic models for solid and liquid phases, with solid solutions behaving ideally or near-ideally.
- Determined phase diagrams for the LiBH4-NaBH4-KBH4 system based on experimental and literature data.
- Experimentally confirmed a new ternary eutectic composition (0.66LiBH4-0.11NaBH4-0.23KBH4) with a melting point of 102°C.
Conclusions:
- The study provides a robust thermodynamic description and phase diagram for the LiBH4-NaBH4-KBH4 system.
- The identified eutectic composition offers a low-melting point material with potential applications in energy storage or chemical synthesis.
- Combined experimental and computational approaches are effective for characterizing complex multi-component systems.
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